DESCRIPTION

BIO_read() and BIO_write() read or write the underlying socket.
BIO_puts() is supported but BIO_gets() is not.

If the close flag is set then the socket is shut down and closed
when the

BIO

is freed.

BIO_set_fd() sets the socket of

BIO

b to fd and the close
flag to close_flag.

BIO_get_fd() places the socket in c if it is not

NULL,

it also
returns the socket. If c is not

NULL

it should be of type (int *).

BIO_new_socket() returns a socket

BIO

using sock and close_flag.

NOTES

Socket BIOs also support any relevant functionality of file descriptor
BIOs.

The reason for having separate file descriptor and socket BIOs is that on some
platforms sockets are not file descriptors and use distinct I/O routines,
Windows is one such platform. Any code mixing the two will not work on
all platforms.